The handling of freehand perspective marks the difference between the amateur and the professional.
Every freehand object drawn has to have an eye level or horizon, sketched if not actually represented. On the left side of the image we see the drawing of the head as seen from above and below the eye level, the Horizon Line. If a head were as big as a building it would be affected by perspective in the same way a building is.
Throughout this introduction my use of technical drawings and perspective may seem over used. The drawings above I hope will express the use of perspective in the hand of a fine artist. Before any painting can be carried out we are committed to create a sketch of what we are about to draw, perspective is usually very important at that stage.
Never try to draw without knowing the position of the Horizon Line, your eye level, because without it you may fail to produce just what you wanted to accomplish. ‘But I like to draw what I can see’. Yes, I agree! But the first thing you see is the Horizon Line.
How do I know that?
Because the brain creates the picture and the brain views just where your eyes are placed. Is it above or below the subject, or anywhere in-between. Use Ellipses, Vanishing Lines and all the other tools of perspective.